Are 3 nights a fortnight too much for a 3 year old with non custodial parent?

Hi all!

So my darling child is 3 and half, she stays with her Dad whose 3 hours away every fortnight – her length of stay is 2 nights.
This is working great.

However, her Dad wants to extend those 2 nights to 3 nights.
She seems fine with the two nights, we have some tricky climatising issues sometimes – but for the most part she loves her Dad and is enjoying her time there.

I don’t want to take it to 3 nights, as once school starts it will revert back to 2 nights and I’d rather it stayed constant for her, I’m also not sure how she would cope and I don’t trust him to tell me how she is.

However has anyone experienced their child doing 3 nights with non-custodial parent and the child being fine?
Particularly a young child – under 5?

I would love to hear your thoughts.
Thank you.